Here’s reason No. 935,000 for collectors to always check old barns for treasures hidden under the hay. A 1908 Harley-Davidson Strap Tank motorcycle recently sold at Mecum Auctions for $935,000, making it the most valuable motorcycle ever sold at auction. The motorcycle, one of only 450 motorcycles produced by Harley-Davidson in 1908, is one of the oldest surviving models. Less than a dozen are thought to have survived. The bike was discovered in 1941 in a Wisconsin barn and then kept in the state for 66 years. It is professionally restored and includes the motorcycle’s original tank, wheels, engine belt pulley, seat cover and muffler sleeve.